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本文应用线弹性断裂力学对某单支墩大头坝的劈头裂缝进行了分析.采用有限元法计算缝端的应力强度因子.用三点弯曲梁试件进行了混凝土断裂韧度的试验.缝内水压力分布和支墩大头部伸缩缝的可压缩性对缝端的强度因子影响较大.分析结果认为,该大头坝急需加固.
In this paper, the linear elastic fracture mechanics is used to analyze the cracking of a single-headed piers dam. The stress intensity factor of the welded ends is calculated by the finite element method. The fracture toughness of concrete is tested with three- The pressure distribution and the compressibility of the large head expansion joints of the pier have a great influence on the strength factor of the seam ends, and the analysis results show that the dam needs urgent reinforcement.